1bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 2bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 3f5256e16dfc425c1d466f6308d4026d529ce9e0bHoward Hinnant// The LLVM Compiler Infrastructure 4bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 8bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 9bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 10bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// <mutex> 11bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 12bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// template <class Mutex> class unique_lock; 13bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 14bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// void lock(); 15bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 16bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <mutex> 17bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <thread> 18bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cstdlib> 19bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cassert> 20bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 21bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantstd::mutex m; 22bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 23bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttypedef std::chrono::system_clock Clock; 24bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttypedef Clock::time_point time_point; 25bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttypedef Clock::duration duration; 26bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttypedef std::chrono::milliseconds ms; 27bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttypedef std::chrono::nanoseconds ns; 28bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 29bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantvoid f() 30bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 31bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::unique_lock<std::mutex> lk(m, std::defer_lock); 32bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant time_point t0 = Clock::now(); 33bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.lock(); 34bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant time_point t1 = Clock::now(); 35bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(lk.owns_lock() == true); 36bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant ns d = t1 - t0 - ms(250); 3766a48c5ad50704194df723ad9e13c7f1bb3c13f4Howard Hinnant assert(d < ms(25)); // within 25ms 38bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant try 39bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 40bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.lock(); 41bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(false); 42bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 43bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant catch (std::system_error& e) 44bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 45bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(e.code().value() == EDEADLK); 46bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 47bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.unlock(); 48bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.release(); 49bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant try 50bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 51bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.lock(); 52bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(false); 53bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 54bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant catch (std::system_error& e) 55bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 56bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(e.code().value() == EPERM); 57bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 58bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 59bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 60bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantint main() 61bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 62bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant m.lock(); 63bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::thread t(f); 64bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::this_thread::sleep_for(ms(250)); 65bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant m.unlock(); 66bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant t.join(); 67bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 68